Keystones — Lintel
Five GCSE retrieval questions · 24 April 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000029 in standard form
Answer: 2.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 22.78cm -
4. Ratio Mixed ratio problems
Express the first part of 4:5 as a fraction in simplest form
Answer: 4⁄9 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 36, 21, 17, 47, what is the missing number?
Answer: 34